[RTTY] Mark & Space - High Tones

[Jim W7RY]

The use of the name "high tones" refered to 2125/2295.  Low tones were 
around 900/1070 (give or take).

Hal communications manufactured ST-6000s with either set of tones.


Please don't confuse high/low tones with which one is mark or space. It's 
either mark or space. Not high or low tone.

73
Jim W7RY

--------------------------------------------------
From: "Joe Subich, W4TV" <lists at subich.com>
Sent: Wednesday, June 08, 2011 12:22 PM
To: "Phil Sussman" <psussman at pactor.com>; "RTTY" <rtty at contesting.com>
Subject: Re: [RTTY] Mark & Space - High Tones

>
>> On USB I believe the designations should be reversed, since 2125 Hz
>> would be the LOWER RF frequency.
>
> You are correct.  MARK is the tone that provides the *HIGHER* RF
> frequency.  Thus if you use USB AFSK the conventional "High tones"
> would be 2295 Hz = Mark and 2125 = Space.
>
> Nearly all material on RTTY (and most Yaesu transceivers designed prior
> to the FT-9000/FT-2000/FT-950) assumes operation in LSB as that was the
> "standard" for nearly 30 years until the "lazy programmers" showed up
> with multi-mode software like HRD, fldigi, MixW, etc. that only worked
> in USB.
>
> Unlike software from the "lazy programmers," MMVARI allows selecting
> *either* USB or LSB for sideband sensitive modes like RTTY, MFSK, and
> QPSK.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 6/8/2011 12:58 PM, Phil Sussman wrote:
>> I've been wandering on the AA5AU RTTY pages in search of
>> Don's email address.
>>
>> After my exchange with Chen, I had a question about the
>> RTTY Intro page on Don's site. It is noted that high tones
>> are 2125Hz and 2295Hz (170 Hz split), Mark and Space
>> respectively. While nothing is specifically mentioned at
>> that point, the Mark and Space designations given are only
>> applicable for LSB. On USB I believe the designations should
>> be reversed, since 2125 Hz would be the LOWER RF frequency.
>>
>> Am I right or merely confused?
>>
>> Thanks ES 73,
>>
>> de Phil - N8PS
>>
>>
>>
>>
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>>
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